commit c61b08e491979aade9dbbfa577bdfab04c849e70
Author: Leszek Koltunski <leszek@koltunski.pl>
Date:   Sat May 23 21:37:40 2020 +0100

    Fix VertexEffectRotate.
    'MeshJoin' app now back it its functionality from 'master'

diff --git a/src/main/java/org/distorted/library/effect/VertexEffectRotate.java b/src/main/java/org/distorted/library/effect/VertexEffectRotate.java
index bcff625..677f02b 100644
--- a/src/main/java/org/distorted/library/effect/VertexEffectRotate.java
+++ b/src/main/java/org/distorted/library/effect/VertexEffectRotate.java
@@ -67,7 +67,7 @@ public class VertexEffectRotate extends VertexEffect
 
       "float angle = vUniforms[effect].x*3.1415/360.0;\n"
     + "vec3 center = vUniforms[effect+1].yzw;         \n"
-    + "float sinHalf = sin(angle);                    \n"
+    + "float sinHalf =-sin(angle);                    \n"
     + "float cosHalf = cos(angle);                    \n"
 
     + "float qx = vUniforms[effect].y * sinHalf;      \n"